Gear-cutting machine.



- T. FAWGUS. GEAR GUTTINGMAGHINB. APPLIQATION rnm'unm, 1911.

1,022,625 "Pa ented Apr.9,1912

3 SHEETSr-SHEET l.

[W I WITNESSES N INVENTOR I I I w x1 8% b6 GIMME! T. PAWCUS.-

GEAR CUTTING MACHINE. APPLICATION FILED Amaze, 1911'.

Patented Apr. 9, 1912.-

3 SHEETS-SHEET 2.

I v o "J INVENTOH Ems WITNESSES T. PAWGUS. GEAR CUTTING MACHINE.

APPLIOATION PIKLBD APILZQ, 1911.

Patehted Apr. 9, 1912.

- y a SHEETSSHEET 3".

WITNESSES INVENTOR ml sms engines m it syit 33229625; 7 .s ecifimioaot Patented ape. 3M2;

Application filer? April 1911. aerial 624,159. i

T all whom it mayconcern: i i i a shaft '17. which in turn may be driven in Be it known that L THOMAS Ruveus. of anv suitahle Wayv as h i means of a belt 4 I i in Pittsburgh, Allegheny county, l'ennsyl amlley l8. lhe shaft ll 15 geared to. the n1a,jl1ave invented a new and usetul lmshalt 16 through the clutch 19, and revers- 60 5"p'0ve1nent in Gea1t-Cuttmg Machines, of n;- g'ears 20. "The clutch is arrauged'tn be which the following is a' full, clear, and sllllittl tu drive the shaft H3 in either direcexact (lFC1l)li0Il reference beuw' had 40' lieu lhruu h a shiftiu member 2 which 7 ta *3 b n I the accompanying drawings, forunng part engagm cam on rock shalt L which,

Of this specification, in WillCl1-- is placed parallel to the aha i 65 10 Figure l is a plan View of a machine e1n- 24- is a transverse shipping rod having the .bod'ying the preferred form of my inYenadjustahle cellars 25. whichare adapted to. tien; Fig. :2 is a side elevation of the same; be engaged hy the respective tool carriers. Fig. 3 is a detail View; of a portien of the 'llie ship 'iing rod 25- is connected to a crank gearing; Fig. 4 is a partial cross-section arm 26 en-the roelc shaft v 23' showinglhe gearing for feeding the tool By means at the connection gearing deslides; Fig. 5 is a-sectienal View showing the scribed, he teul carriers are sinniltaneously gearing for e 'ierating the indexwheel and um =d tewardwu' away from each 0th 0 for moving the blank during the formation u mn the tent slide, and at the preper time of 21 teeth; and Fig. (l is a deta'l View et a thc'r nun'einent is automatically reversed 75 portionof such gearii'ig. designates the shaft or mandrel, W-li'ieh My invention has relation to gear cutting is mounted in suitahle hearin :2? of the machines, and more particularly to a rnaframe. and upon which is mourned the blank chine for cutting deuhle helical gears of It in which the teeth are to he formed} relatively large pitches and diameters, and The shall 52? carries" an index'u 'heel 28 havis designed to provide a machine of thia Z ng \i'nrui teeth 29 in iteuieriplrei'y engaged character by means of \Vllii'll gears (if this hy \Ytll'lll 60 on the shaft 33 ll (2 shaft 31 classcan be accurately cut with couumralive being driven in the manner her ='nafter de-- rapidity. scribed, Y Referring to the accompanying drawings The shat-t H) at the ep meil'e end frenr the numeral 2 (lESlQHZLl'ER the concrete base where it driven carries a mini gea 32':

' ii a et at change years 33, urn'e a 93 all; i l l. T shaft 3% 1th the l 53:3 which iueehea of the machine, which ii'eterahly set ever a pit 2:", into which the blank to he cut ean arraug" extend. Each SKlQ portion of the lied 15 arl-lee previded' with. a rail l having a wa'v teeth ml in worm se it 3 3, vliieh 55 therein. in WlliL'll hm itudnial-l nmvahle IS lens el Qy -yl( 2} l l en die Stool slide 3 is muunteil The teulfilidc is adjacent in the ind 3; Wheel 5253.

iapahle of heii gnawed hack and {firth in iii lie ere r ferrer l le journa these ways, and set at any deel iii position, whu are carried i tlii "swinging in a manner well. knuu'n in the art" The shaft or arhe i Mounted on the tool slide are two tranw l l versely movable tool carriers 7 each which has a teeth former a and a cut-tel l 1) and The/ten} carriers and teeth "formers; e? with anysuitahle clmracter Well knmm in the art ill ing a Worm m9 &5 and torin no part at my invenlien ewe: at in Fitz; (3), The Shaft 42 i n i J combination. ille cutters f) are preterm) single pointed ()1I' ])ldll0l' teuls. The :Ll' arranged to be suiniltanebusly mewul L y a sleeve 42",

e Fig: l). h wurin Wheel on h u turn drives a all supper-ted on T e wei'n'i $3 t e shaft, 31, I

a'vard or away frem each ether by u'ieans 0i 1; plate lii the spur gears 10, which are mounted on the gears shafts llanl engage with r" a l ill'i a sin of these shatlrs. carries xi zieh whi h meshes with a wernr 1'1;

verse shaft l4. The Si bevel gears with a i 111g shaft 16 The shaft in of the stop plate also acts secured to the sha t I reverse,

'the operation is repeated,

face of the ear blank, the latter simultaneously rotating toward the tools until they reach the center when the tool carriers actuate the shipping rod 24: causing the clutch 19 to throw the reversing gears into operation. The shaft 16 is thus caused to thereby reversing the movement of the tool carriers and the blank. When the tool carriers returnto their initial position a feeding movement of the tools bein V btained through the gears B, or in any ot er suitable manner, over the former This cutting process is repeated and continues (the tools meanwhile advancing into the ear blank) until the full depth'o'f the toot is reached. The tools are then .withdrawn from the cut'by 'the operator, and another tooth face is brought into position. The cutting operations are repeated until the circuit of the entire blank has been made. The opposite facesof the teeth are then planed in a similar manner. In order to obtain the proper angularity of these teeth, it is evident that the blank must be rotated during the cutting operation, as

above described, in the direction of-the ar-- row on Fig. 1, since it the blank were not so rotated, the formed teeth instead of having the required angularity would extend straight across the periphery of the blank. It is for this purpose that the'swinging segment 36 is provided. The rotation of the shaft.16 through the change ears 33 rotates the shaft 34, carrying t e worm 35 which meshes with the worm teeth on the segment. It will, therefore, be apparent that the worm segment will be swung 0n the and throu h the worm.

shaft or arbor 3 30, the segment becomes locke to the index wheel 28, which is -fast to said, shaft. Therefore, the shaft 27 will be rotated, through an 'arc proportional to the arc of movement of the segment. When the direction of rotation of th 'shal't -16 is re versed'at the completion of each tooth -f orm o eration', the segment and blank are' in mgve back to their previous initial positions. When 'the full depth has been reached by successive operations of v this character, the operator actuates the connection .49 to withdraw the dog 46 from the 8 and another cut is made.

"The a ment, it is obvious that acomplete worm notch of the stop plate; and by this movement of the bell crank .48, the motor circuit is closed'at 50, and the pulley 38 is revolved, thereby causing the rotation of the shaft 31 and the proper movement of the index wheel. The stop plate is alsorotated through the change gearing' ifi, and as soon as the notch or recess comes opposite the dogthe latter will be forced into. engagement therewith, and the circuit of the motor will be broken at 50. This stop plate insures I the roper step by step teedin' movement of t e blank for the spacing o sive teeth.

The change gears 33 provide means for varying the rotative movement of the blank so as to secure the requirediangularity of the teeth; and the change gears at 45 provide means for varying number of teeth.

' the succes- In the caseof large gear wheels, the teeth are preferably roughly cast on the blank A, and are finished by the cutting operations described. Proper clearance may be provided at the central portionof the blanks known manner, such as a peripheral groove} or by casting clearance spaces asshownjon blank A, Fig. 1, thereby leavin tion between the two parts 0 the" tooth" similar to that described in my Patent No'."

980,232, granted January 3rd, 1911.

vantages of my invention result the' spacing and v by a previous cutting operation, "in-}any"well from the provision of a machine of simple character by means of which the two parts of the double helical teeth may be simultaneously. cut in a singe casting or blank at any desired angle with relative rapidity and with great accuracy. By the use of single pointed tools, similar lbs to planer or shaper tools, a minimum amount of clearancespaceis required as compared with that needed for milling tools.

This is a very valuable advantage in gears of large pitch. The use of tools of this character also greatly reduces the cost of .the operation, since the initial cost of these tools is relatively small and in case of any injury thereto they can readily be repaired or replaced.

It will be obvious that various changes vma be made in the details of construction an arrangement of the parts without departing from the spirit and scope of my invention as defined in the appended claims. Thus,'the tool slides, tool carr ers, and toothforming means may be of any well known .or. Suitable character;"'the manner of driving th several parts together with the details of the gearing may be varied, and various other changes may be -made. By throwing the swinging segment- 36 out of action, the machine may be used for cutting spur gears, if desired. Instead of a segroeaeeu i cal gea'rgthe combination of a rotary blank CflII-'181,'"II1ll1$ for imparting a step by step indexing movement thereto between the successive cutting operations, means for 1m-.

parting a,,rotarymovement to the blank during the cutting, and cutting tools ar-' ranged to simultaneously cut'from opposite sides of the blank toward the center thereof; substantially asdescribed. 2. In a gear cutting machine, the combination with a rotary blank carrier and an index gearing for imparting successive step by step movements thereto, of two cutting tools arranged to cut from opposite sides of the blank toward the center thereof, and other gearing for rotating the blank during the cutting operations; substantially as described.

3. In a gear cutting 1 nacl 1ine ,the combination with a blank supporting shaft or arbor and index gearing and stop mechanism for imparting a step by step movement to the shaft or arbor between successive cutting operations, of two cutting tools arranged to cut from opposite sides of the blank toward the center thereof, and other gearing arranged to ettect a rotary movement of the carrier during the cutting operations; substantially as described.

4. In a gear cutting machine, the ccmbination with a rotary blank supporting shaft or arbor, and gearing for imparting'a step by step indexing movement thereto, said gearing including an index wheel, of a movable gear member loosely mounted on said carrier, gearing for actuating said gear member during each tooth-forming operation, and means for causing the movement of the gear member to impart a correspond. ing movement to' the blank carrier and blank; substantially as described.

5. In a gear cutting machine, the combination with a rotary blank supporting shaft or arbor, and means for imparting a step by step indexing movement thereto intermediate the tooth-torming operations, of an index wheel secured to said shaft andhaving worm teeth, a swinging gear member loosely mounted on the shaft, a worm carried bysaid gear member and n'ieshing with the worm wheel, and gearing tor actuating "the gear member maybe changedg sub step indexing movement thereto, tw pointed cutting tools, means for snnnlta c a former for guidin each tool tof'pro'd e g worm carried by said gear member and meshing with the worm'wheel,andg for actuating the gear member du'rn tooth-forming operation, together means whereby the extent of lllOXiQfllbl tially as described.

7. In a gear cutting machine, ti nation with a rotary blank support 1g,shor arbor, means for imparting a ously actuating said tools, to c ause ltl make cuts from opposite edges ot'the la the tooth curve and other gearing forumparting rotary movement to the blank during the cutting operations of said tools; substantially as described.

8. In a gear cutting machine, a rotary blank carrier, a pair of cutting tools ar ranged to cut from opposite edges of the blank toward the center, both tools acting upon the blank at the same side of its axis of rotation, and means for imparting a rotary movement to the blank during the cutting operation of the tools; substantially as described.

9. In machine forcutting helical gears, the combination of a rotary blank carrier, means for imparting a step1by-step index-. ing movement thereto between the successive cutting operations,-and cutting tools arranged to cut from opposite sides of the blank toward the center thereof, said tools being all at the same side of the axis of rotation of the blank, substantially asdescribed.

10. In. a machine for cutting helical gears, the combination of a rotary blank carrier, means for imparting a step-by-step indexing movement thereto between the successive cutting operations, and cutting tools arranged to out from opposite sides of the blank toward the center thereof, all of said tools being arranged to operate upon different portions of the same tooth, substantially as described.

11. In a machine for cutting double helical gears, the combination of a rotary blank carrier, means for imparting a step-by-step indexing movement thereto between the successive cutting operations, means for imparting a rotary movement to the blank during the cutting, a singletool slide, a pair of tool carriers mounted thereon, a single pointed cutting tool mounted on each carrier, means for actuating the tool carriers, and formers for guiding tools to produce the tooth curves, substamially as de scribed.

12. In machine tor'cutting gears, the combination oi a rotary blank carrier, means "for imparting a stepby-step index ing movement thereto between the snccessive cutting operations, a single tool slide,

a pair of tool carriers mounted on said slide and reciprocable in a direction parallel to the axis of the blank, means for actuating the carriers, and a cutting tool mounted on each -carrier, said tools being arranged to cut from op'positesides of the blank, substantially as described.

13. In a machine for cutting double helical gears, the combination of a rotary blank carrier, means for imparting a step-by-step' indexing movement thereto between the successive cutting operations, means for impart ing a rotary movement to the blank during the cutting, a single tool slide moyable toward and away from the blank, two transversely reciprocating carriers mounted on the slide, means for simultaneously actuating said carriers, and'a single pointed cutting tool mounted on each carrier, said cutting tools being arranged to simultaneously .cut from opposite sides of the blank toward the center thereof, substantially as described. In testimony whereof, I' have. hereunto set'my hand. 

